I can not access to the ISPconfig first page

I have gotten a bad headache after the recently installing of ISPconfig2.
After of the forst installing, I access to panel by https. but after a few hours up to now I just receive "network timeout" and can not access to the first page of it.
I reinstall it several times but...
nmap shows that port 81 in open but I can not telnet to 81 from outsite. in addition netstat shows that ispconfig in listening to port 81!!!
finally, I can login by lynx on the server itself but not from anywhere else!!!

I stop the bastille-firewall service.
I use Ubuntu 8.04TLS, kernel 2.6.24-16

when I nmap from outside :

---------------------
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
53/tcp open domain
80/tcp open http
110/tcp open pop3
143/tcp open imap
443/tcp open https
993/tcp open imaps
995/tcp open pop3s
3306/tcp open mysql
10000/tcp open snet-sensor-mgmt
-------------------

Is the server in your local network? If so, did you try to access it from within your local network or from outside? If from outside, did you configure your router to forward port 81 to your ISPConfig server?